I don't know how much chlorine is too much, and don't know how much is already in your water.
I do know that the plastic somehow seems to absorb the taste over time, and that they recommend 8 drops per gallon for clear water, and 16 drops per gallon for cloudy water, so there's some latitude.
If you ping me with freepmail, I'll check it out with some chemists I know.
OK, will do.